body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  color: #222;
}
header {
  background: #000;
  color: #ffc800;
  padding: 20px;
  text-align: center;
}
nav a {
  margin: 0 10px;
  color: #ffc800;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 20px;
}
.hero img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 0 auto;
}
.logo-pollein {
  max-width: 250px;
  margin: 20px auto;
  display: block;
}
footer {
  background: #eee;
  text-align: center;
  padding: 15px;
  margin-top: 40px;
  font-size: 0.9em;
}